Edward roberts



Patented June 16, 1868,

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E. ROBERTS.

Cutting Teeth on Metal Wheels.

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EDWARD ROBERTS, OF PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 78,896, dated June 16, 1868.

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TO ALL WHOM Il MAY'GONCERN: Be it known-that I, EDWARD ROBERTS, of city of'Philadelphia, in the State of Pennsylvania, have invented a' new and useful Improvement in the Teeth-Cutting Engine; and I do hereby declare that the following is a full, clear, and exact descriptiouof the construction and operation ofthe same, reference being had 'to the accompanyingdrawin'gs, making a part of this specification, in-which .Fig ur'e ,1 is a perspective view, showing the improvementapplied.

Figure 2, a horizontal section of the same, and

Figure 3 a side'view of one of the'cu tters- Like letters of reference indicating the same parts when in the different figures.

My improvement relates more especially to the cutting of the tapering teeth in the-spur-wheel which is operated by the worm-wheel in a gas-meter, and has for its object the cutting of such teeth with greater accumay and facility than heretofore.

My in ention consists in the arrangement of two cutting-disks parallel with each other, on the same rotary shaft, and equidistant from an imaginary straight line passing through the centre of the wheel which is to be out, substantially as hereafter described and set forth. I p

Referring tothe drawings, A A are the two. cutters, B the rotary shaft, 0 the wheel as being cut, and D the base upon which the said wheel issupported.

The cutters A A are flat disks of tempered steel, each having serrated notches or cutting-teeth around its periphery, and a hole, a in its centre, as represented in fig. 3. v

The shaft 13 is made in the usual manner, having a fixed shoulder, b, and an adjustable screw-nut, b, for

securing the various-sizedcutters thereon, as heretofore; out in addition to the adjustable nut 25", I apply a washer or stretcher, 1/, between the shoulder b' and the nut b, and thus provide for securing the two like cutters, A A, upon thesaid shaft, at the proper or intended distance apart. vThe length of the said stretcher 6' must be made to correspond with the intended distance apart, on the wheel 0, of the furthest-apart sides of two contiguous teethat their bases, and the shaft B supported to rotate in a horizontal position upon the points of two end-screws, (in the carrying-frame,) so that the said shaft can be adjusted endwise thereby, to suit the length of the particular stretcher used. The frame which carries the shaft B is not shown in the drawings, because it is intcndecl to be constructed and applied in the usual well-known manner, so that it'ean be readily moved up and down in front of I the wheel 0, whereby the rotary cutters are caused to pass across through the perimeter of the said wheel in cutting the teeth required; the shaft being rotated by a band, also applied in the usual manner.-

The wheel 0 to be cut is fixed rigidly, by a screw-nut, upon the spindle of the usual index-plate, (not shown in the drawings,) so that it can be moved around by hand, in accordance with the number and distance apart of the teeth required in the said wheel. 7

In adjusting the positions of the two cutters AA upon the shaft 13, (by means of the described shoulder 6, stretcher 5', and nut 6",) and thc"position of the shaft itself, longitudinally, (by means of the described supporting) and adjusting end-screws in the usual carrying-frame, the middle of the length of the stretcher 6' must bebrought exactly in a straight line, passing horizontally through the centre of the wheel C, at right angles to the shaft 13, as represented in connection with a dotted line in fig. 2, and consequently the two cutters A A will then be parallel to the said line and to each other, and also at equal distances from said line.

In the operation of the cutters A A upon the wheel to be toothed, G, it will be seenthat on the first passage of the said cutters, two slots will be cut in the periphery of the said wheel, which will be parallel to each other, as seen in fig. 2; that ifthe wheel 0 benow rotated bymoviug the'index-plate one space, and the cutters then again passed across through'its periphery, two other like cuts, parallel to each other, will bemade, the one out being midway betweenthe two first cuts, and the other an equal distance outside of one of them; that if the wheel Gbe then again rotated another notch of the index-plate, and the cutters A A again passed across through the periphery of the wheel G, the rear cutter, in respect to the direction in which the slots are being cut around in the wheel C, will cutaway-one side boundary of the slot which it enters, and thus taper that side of the tooth, the other side of said tooth having already the proper taper given to it, in first cutting the slot -parallel with the radial line, and 'so on, operating in regular progression on the wheel 0, one cutter making a straight slot, which gives the required taper to one side of a tooth to he made, and the other cutter tapering the side of the tooth which is next to the previously-cut slot, until the whole of the required teeth have heencutland tapered,

connected with serrated cutting-teeth on its periphery, but the liability of such cutter to break off the tooth which is being made, especially when the diskwhich is being toothed thereby is made of the hard metal required in the gas-meter wheels specified, has rendered it preferable, at the present time, to use acutter without the I am aware that tapering teeth can be cut at once by a single cutter, having bevelled side-cutting edges bevel-teeth, its periphery only'being serrated, so as to cut a straight slot with parallel boundaries, which are afterward widened by hand-filing, so as to give the required taper to the teeth.

I do not claim any of the devices herein described separately, for they are all old and well known; but What I claim as new, and desire to'secure by LettersPatent, is- The combination of the spindle, collar, and clamping-nut, for supporting and clamping the wheel, with the device, consisting of the two cutter-disks, stretcher, tightening-nut, and adjustableshai't or arbor, all arranged substantially as described.

, EDWARD ROBERTS.

1 Witnesses:

BENJ. Momson, WM. H. MORISON, Jomv Wilma, 

